Export Container Detention and Per Diem: What Port of Long Beach Exporters Need to Know
Export-container detention, per diem, and demurrage charges can accumulate quickly when equipment timing, ERD changes, or booking issues extend the move. This guide explains how the export equipment clock works, what can cause charges to build, and what information to confirm before picking up an empty container.
The short answer
Export-container detention or per diem is a charge that can accrue when carrier equipment remains outside the marine terminal beyond the free time allowed under the governing tariff or service contract. The clock typically starts when the empty container is released from the authorized pickup location and continues until the loaded container is returned and accepted at the terminal.
Free-time allowances, calculation methods, and billing rules vary by ocean carrier, service contract, terminal, booking, and shipment. No single universal rule applies to every Port of Long Beach export move.
Operational delay and billable time are related but not identical. Whether a charge applies — and how much — depends on the governing tariff, service contract, free-time terms, billing rules, and the specific facts of the shipment.
Export detention and per diem explained
When an ocean carrier releases an empty container for an export shipment, the carrier typically allows a set number of free days for the shipper or their logistics team to pick up the equipment, load it at the commercial facility, and return it to the marine terminal. This period is defined in the carrier's tariff or the applicable service contract.
If the loaded container is not returned within the free-time window, the carrier may begin assessing detention or per diem charges for each additional day the equipment remains outside the terminal. The rate, calculation method, and any grace provisions depend on the governing tariff and contract terms.
Some carriers use the terms detention and per diem interchangeably for export equipment. Others apply distinct definitions. Confirm the applicable terminology and terms with the responsible ocean carrier for each booking.
Export detention vs. export demurrage vs. terminal storage
These three charge types are related but distinct. Terminology and definitions vary by carrier and terminal — the descriptions below reflect common usage, not a universal standard.
Export detention / per diem
A charge that may accrue when carrier equipment (the container) remains outside the terminal beyond the free time allowed under the tariff or service contract. Typically covers the period from empty-container release through loaded return at the terminal.
Export demurrage
A charge that may accrue when a loaded export container remains at the marine terminal beyond the free time allowed before vessel loading. Some carriers merge this with detention under a combined D&D structure. Confirm the applicable definition with the responsible carrier.
Terminal storage
A separate charge assessed by the marine terminal operator for containers occupying terminal space beyond the allowed free time. Terminal storage is distinct from carrier detention and demurrage and is governed by the terminal's tariff.
When the export equipment clock may begin
For most ocean carriers, the detention or per diem clock begins when the empty container is released from the authorized pickup location — typically a terminal, depot, or chassis pool. The free-time period then runs until the loaded container is returned and accepted at the marine terminal.
The exact trigger, free-time allowance, and whether days are counted as calendar days or working days depend on the governing tariff and service contract. Some carriers apply different free-time terms based on container size, commodity, or service lane.
Confirm the applicable free-time terms with the responsible ocean carrier before scheduling the empty-container pickup. Do not assume that the free time shown on a previous booking applies to the current shipment.
Why published free time is not always the usable loading window
The carrier's free-time allowance and the terminal's receiving window are two separate constraints. Even if the carrier's free time has not expired, the terminal may not yet be accepting containers for a particular booking — the early return date (ERD) may not have opened, or the terminal may not have the booking in its system.
The usable loading window — the period during which the shipper can actually load the container and return it to the terminal — is bounded by both the carrier's free-time clock and the terminal's receiving window. If the ERD opens late or the cargo cutoff is earlier than expected, the practical window may be shorter than the published free time suggests.
See the guide on ERD vs. cargo cutoff for a full explanation of the terminal receiving window and how these dates interact.
How ERD changes and vessel delays can affect the move
ERDs and cargo cutoffs can change after the initial booking confirmation — and sometimes after the empty container has already been picked up. A forward shift in the ERD means the terminal will not accept the loaded container until a later date, which can reduce the usable loading window or extend the time the equipment remains outside the terminal.
Vessel delays, rolled sailings, and booking cancellations can have similar effects. If the vessel is delayed or the booking is rolled to a later sailing, the loaded container may need to remain at the loading facility or be returned to a terminal that is not yet receiving for the new voyage — potentially extending the equipment's time outside the terminal.
Whether any of these events produces a billable charge depends on the governing tariff, service contract, and the carrier's applicable force majeure or operational-delay provisions. Monitoring carrier and terminal notices after empty pickup — and confirming the current receiving status before dispatch — can help the responsible party identify and respond to changes promptly.
What happens after the loaded container is gated in
Once the loaded export container is accepted at the marine terminal, the carrier's detention or per diem clock typically stops. However, the container then enters the terminal's custody, and export demurrage or terminal storage charges may begin to accrue if the container remains at the terminal beyond the applicable free time before vessel loading.
A loaded container that is rejected at the gate does not stop the carrier's detention clock — the equipment is still outside the terminal. If a rejection occurs, the responsible party should identify the cause and resolve it before attempting another return. See the guide on why a loaded export container may be rejected at the terminal for a full breakdown of causes and verification steps.
Successful gate-in does not guarantee vessel loading. Confirm terminal acceptance and vessel-loading status through the appropriate carrier or terminal systems.
Common reasons export charges accumulate
The following situations can contribute to detention, per diem, or demurrage exposure. Whether a charge applies in any specific case depends on the governing tariff, service contract, and shipment facts — not every delay automatically produces a fee.
Information to confirm before empty-container pickup
Confirming the following before scheduling the empty-container pickup can help the responsible party identify timing constraints and avoid unnecessary equipment exposure. Previously confirmed information can change — do not rely on details from an earlier shipment.
Records to preserve
If a detention or per diem invoice arrives, the following records may help the responsible party review the charge, identify discrepancies, or support a mitigation, refund, waiver, or dispute request with the billing party. Preserving these records does not automatically invalidate a charge.
How to review or dispute an invoice
When a detention or per diem invoice arrives, the responsible party should first verify that the charge is consistent with the governing tariff, service contract, and the actual shipment timeline. Key questions include: Does the invoice identify the container, booking, and charge period? Does the free-time calculation match the applicable tariff terms? Are the dates consistent with the empty interchange receipt and loaded gate receipt?
If a discrepancy is identified, the responsible party should contact the billing party promptly. Most carriers have a defined process for submitting mitigation, refund, or waiver requests. The applicable deadline for submitting a request is set by the carrier's tariff or service contract — confirm it before the window closes.
For complex billing disputes or situations involving significant charges, consulting a licensed customs broker, freight forwarder, or qualified maritime attorney may be appropriate. This article provides general information only and is not legal advice.
Current FMC billing requirements
General information — not legal advice
The Federal Maritime Commission has established billing requirements for detention and demurrage invoices issued by vessel-operating common carriers (VOCCs) and marine terminal operators. Subject to applicable rules and exceptions:
- VOCCs and marine terminal operators generally must issue compliant detention-and-demurrage invoices within 30 calendar days after the charges stop accruing.
- The billed party generally receives at least 30 calendar days to submit a request for mitigation, refund, or waiver.
- The billing party generally has 30 calendar days to attempt to resolve that request, unless the parties agree to an extension.
- Invoices must contain required information sufficient to identify and evaluate the charge.
In 2025, a federal court set aside the "properly issued invoices" provision at 46 CFR 541.4, which had addressed who may be invoiced. Other portions of the billing rule remain effective, including invoice-content requirements and applicable issuance deadlines. Readers should review the current FMC guidance and, when necessary, consult a qualified professional.
For current FMC guidance, see the FMC detention and demurrage overview and the FMC notice on the 2025 court decision.
For a broader overview of demurrage and detention concepts on the import side, see the separate guide on how to avoid container demurrage and detention charges. That guide addresses import-side scenarios; the billing framework and terminology described there may differ from export-side arrangements.
Coordinating Port of Long Beach export container transportation
ITZON TRANSPORT coordinates export container drayage between authorized empty-pickup locations, Southern California commercial loading facilities, and Port of Long Beach marine terminals. Transportation is coordinated based on shipment information supplied by the customer, freight forwarder, ocean carrier, booking party, and applicable terminal systems.
ITZON TRANSPORT does not set carrier tariffs, free-time terms, detention rates, terminal storage rates, ERDs, cargo cutoffs, or vessel schedules. ITZON TRANSPORT does not issue carrier invoices or decide billing disputes, and cannot guarantee that a shipment will avoid detention, demurrage, storage, or other charges. Shipment-specific terms must be confirmed with the responsible ocean carrier, billing party, freight forwarder, or other appropriate party.
For a complete overview of how the export container move is sequenced — from empty pickup through loaded return — see the export container drayage process guide. For freight forwarders and third-party logistics providers coordinating multiple export shipments, see the guide on drayage for freight forwarders and 3PLs. Coverage extends throughout Southern California — see the service areas page for details.
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